Hello Paul,
I'm in the early planning stages of my Velocity electrical system, and I

was

wondering if you have any words of wisdom with regard to electrical system
issues that are unique to a rotary conversion.  I am planning to use the
stock 20B alternator / regulator.

Thanks,
Don Mitchell

Is there a built in regulator in that 20B alternator?
If so it could, in theory, run your battery down faster than if you
had an external regulator with separate field winding.
I think the failure mode that causes this is a shorted field.
It helps if you can disconnect a shorted field from the battery.
That way the EFI/IGN can run longer. Something along these
lines as I recall.

Paul Lamar

Yes, it is a 90A alternator with an internal regulator.  Would you recommend
replacing it with a different alternator?  If so, what alternator / regulator
is being used by most builders out there?

Don Mitchell

Yes if you want to be strictly safe in this regard. Any alternator without
a built in regulator should work. They come in all sizes. I suspect something
out of a Honda would be good. As far as what everybody else is using...???
 
Paul Lamar
 
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